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Table 1 WHO-sampling method[12, 15]

From: Declining trends in early warning indicators for HIV drug resistance in Cameroon from 2008–2010: lessons and challenges for low-resource settings

Number of newly enrolled patients on ART per year Required sample size
1-75 Recruit all
76-110 75
111-199 100
200-250 110
251-299 120
300-350 130
351-400 135
401-450 140
451-550 145
551-700 155
701-850 160
851-1600 175
1601-2150 175
2151-4340 200
4341-5670 210
5671-10,000 215
>10,000 WHO advice required
  1. WHO: World Health Organization.